100 µH at 180 mA — where the current ratings govern the rail fit
The LQH43PB101M26L is a 100 µH shielded wirewound inductor from Murata's LQH43 series, built on a ferrite drum core. The 180 mA continuous current rating sets the DC load it can carry before the core saturates or the winding temperature exceeds the ferrite's Curie point. The saturation current is 320 mA, meaning the inductance holds stable up to that peak before rolling off — a margin of 1.8× over the rated current that gives the power-stage designer headroom for transient spikes without losing filter attenuation.
1.84 Ohm DCR — the conduction loss and the thermal budget
The 1.84 Ohm maximum DC resistance translates to I²R loss: at 180 mA the winding dissipates about 60 mW.
Self-resonant frequency at 4 MHz — the usable band ceiling
The self-resonant frequency (SRF) is 4 MHz. Above that frequency the inductor's parasitic capacitance dominates and the component behaves capacitively. For a buck converter switching at 500 kHz, the SRF is 8× the fundamental, so the inductor still looks inductive at the switching frequency and its harmonics up to the third or fifth. For an EMI filter targeting conducted emissions in the 150 kHz–30 MHz band, this part is effective below 4 MHz; above that the filter roll-off flattens and a higher-SRF inductor is needed.
1812 SMD — footprint and board-fit note
That is a standard footprint shared across the LQH43 series and many other Murata shielded inductors — a layout already using a 100 µH from the same family can drop this part without a board spin. The ferrite core and shielded construction contain the magnetic flux within the package, so adjacent components on a dense board see minimal coupling.